Resistance and Power

Q1: With Ohm's law, if voltage increases and resistance stays the same:

A
current remains the same

B
power decreases

C
current increases

D
resistance decreases

Q2: With 1 mA of current, what wattage rating should a 470 ohm resistor have?

A
1/4 watt

B
1/2 watt

C
1 watt

D
2 watts

Q3: A potentiometer has how many leads?

A
1

B
2

C
3

D
4

Q4: A color code of orange, orange, orange is for what ohmic value?

A
22 kilohms

B
3300 ohms

C
44000 ohms

D
33 kilohms

Q5: Wirewound resistors are usually used in circuits that have:

A
high current

B
negative temperature coefficients

C
low power

D
high voltage

Q6: Resistors are identified as to wattage by:

A
size

B
color code

C
types of materials

D
internal construction

Q7: What resistor type is found in SIPs and DIPs?

A
metal film

B
wirewound

C
metal oxide

D
thick film

Q8: A good fuse will have:

A
zero ohms resistance

B
a medium resistance

C
a high resistance

D
an infinite resistance

Q9: The unit designator for resistance value is the:

A
ampere

B
ohm

C
volt

D
watt

Q10: One problem with mechanically variable resistors is noticeable in audio circuits as:

A
scratchy noise

B
lack of bass response

C
variable volume

D
too much treble response

Q11: A wire with a smaller cross-sectional area will produce:

A
less heat

B
more conductance

C
less resistance

D
more heat

Q12: How do fixed resistors usually fail?

A
slowly over time

B
by increasing their value

C
by becoming an open circuit

D
by increasing their value and becoming an open circuit

Q13: What happens to current and resistance if the voltage doubles?

A
Current doubles and resistance doubles.

B
Current doubles and resistance is halved.

C
Current remains the same and resistance doubles.

D
Current doubles and resistance remains the same.

Q14: Good insulators:

A
have few electrons in their outer shells

B
have a large dielectric strength

C
have a small breakdown voltage

D
have many electrons in the nucleus

Q15: One advantage of a carbon film resistor over a carbon composition resistor is:

A
less circuit noise

B
smaller size

C
higher wattage

D
poor tolerance

Q16: What is the most commonly used conductor in electronics?

A
aluminum

B
copper

C
gold

D
silver

Q17: Resistor tolerance is either printed on the component, or is provided by:

A
keyed containers

B
size

C
color code

D
ohmmeter reading

Q18: What is the ratio of 13 to 47 expressed in percent?

A
2.76%

B
27.7%

C
3.60%

D
36.1%

Q19: One ampere of current flowing through one ohm of resistance is equal to:

A
1 horsepower

B
1 Btu

C
1 watt

D
1 joule

Q20: Ohm's law is not:

A
V = IR

B
I = V/R

C
R = IV

D
R = V/I

Q21: A rheostat is ___.

A
a two-terminal device that controls current

B
a three-terminal device that controls current

C
a two-terminal device that divides voltage

D
a three-terminal device that divides voltage

Q22: What is the most commonly used conductor in electronics?

A
aluminum

B
copper

C
gold

D
silver

Q23: Which type of test equipment is used to measure resistors?

A
ohmmeter

B
ammeter

C
voltmeter

D
watt meter

Q24: How many ohms of resistance allows a current of 720 mu.gifA to flow when 3.6 kV is applied?

A
200 nomega.gif

B
5 komega.gif

C
200 komega.gif

D
5 Momega.gif

Q25: A 22-gauge wire will have a diameter in mils of:

A
10.03

B
22.35

C
45.26

D
71.96

Q26: How many connections does a potentiometer have?

A
1

B
2

C
3

D
4

Q27: The six basic forms of energy are:

A
light, sun, magnetic, chemical, electrical, and mechanical

B
electrical, mechanical, light, heat, magnetic, and chemical

C
electrical, mechanical, sun, heat, chemical, and light

D
potential, sun, light, chemical, electrical, and mechanical

Q28: What are the two major categories for resistors?

A
low and high ohmic value

B
commercial and industrial

C
low and high power value

D
fixed and variable

Q29: What are the parts of a rheostat?

A
wiper and resistor track

B
solenoid and armature

C
contact and wire wound

D
center tape and wiper

Q30: What property does an incandescent lamp possess?

A
cold resistance

B
hot resistance

C
ballast resistance

D
both cold and hot resistance

Q31: How is a 3.9 komega.gif resistor color-coded?

A
red, white, red, gold

B
red, green, orange, silver

C
orange, white, red, gold

D
orange, green, orange, silver

Q32: If a variable resistor's resistance varies in a nonuniform manner as the shaft is moved, it is considered to be:

A
linear

B
defective

C
not wirewound

D
tapered

Q33: If a calculator display was "0.00263," what would this answer be in percent?

A
0.026%

B
0.26%

C
2.63%

D
26.3%

Q34: Good insulators:

A
have few electrons in their outer shells

B
have a large dielectric strength

C
have a small breakdown voltage

D
have many electrons in the nucleus

Q35: For P = V2/R, a decrease in resistance should produce:

A
a decrease in power

B
an increase in ohms

C
an increase in power

D
a decrease in current

Q36: Components designed to oppose the flow of current are called:

A
insulators

B
conductors

C
resistors

D
heat exchangers

Q37: What is the power dissipated by a 1.2 komega.gif resistor with 12 volts across it?

A
12 W

B
1.2 W

C
.12 W

D
12 mW

Q38: What type of resistors have a tolerance rating of 5% or greater?

A
precision

B
SIP

C
general-purpose

D
wirewound

Q39: If a metallic conductor has a positive temperature coefficient of resistance, then:

A
as temperature increases, resistance decreases

B
as current increases, resistance decreases

C
as voltage increases, current increases

D
as temperature increases, resistance increases

Q40: Which formula shows a direct proportionality between power and voltage?

A
V = IR

B
P = VI

C
P = IR

D
I = V/R

Q41: If resistance decreases, then current will:

A
decrease

B
increase

C
remain the same

D
double

Q42: The load resistance increases. How will the load current change?

A
vary

B
remain constant

C
increase

D
decrease

Q43: Which is the most important step utilized when measuring resistors?

A
use the highest possible scale

B
keep test leads short

C
zero the meter before using

D
remove power from the circuit

Q44: The resistivity of copper is:

A
9.9 omega.gif

B
10.7 omega.gif

C
16.7 omega.gif

D
17.0 omega.gif

Q45: What value of a 1.3 komega.gif resistor as measured by a digital voltmeter would be considered within tolerance?

A
1234 omega.gif

B
1235 omega.gif

C
1366 omega.gif

D
1367 omega.gif

Q46: With 1 mA of current, what wattage rating should a 470 ohm resistor have?

A
1/4 watt

B
1/2 watt

C
1 watt

D
2 watts

Q47: Power is defined as:

A
the rate at which energy is used

B
watts

C
energy

D
the rate at which energy is generated

Q48: The source is 24 volts and the load resistance is 100 . What is the load current?

A
2.4 A

B
240 mA

C
24 mA

D
2.4 mA

Q49: Good insulators:

A
have few electrons in their outer shells

B
have a large dielectric strength

C
have a small breakdown voltage

D
have many electrons in the nucleus

Q50: How much energy is stored if 6.24 x 1018 electrons are stored in 4 volts?

A
4 joules

B
1.56 x 1018 electrons

C
1.56 coulombs

D
2.496 x 1019 electrons

Q51: Electrical equipment is protected against excessive current by a(n):

A
fusible wire link

B
insulated glass container

C
metal ended coil

D
circuit opener

Q52: After a lamp is turned on, its filament resistance will change to become:

A
less resistive

B
cooler

C
brighter

D
more resistive

Q53: What current is flowing in the circuit?

mcq2_1002_1.jpg

A
288 kA

B
2 kA

C
50 mA

D
500 mu.gifA

Q54: How many basic types of resistors exist?

A
1

B
2

C
3

D
4

Q55: A conductor's cross-sectional area in circular mils for onehalf.gif inch is:

A
500 cmils

B
100,000 cmils

C
1,000,000 cmils

D
500,000,000 cmils

Q56: A 33 komega.gif resistor with a 20% tolerance checks out as ok with which of the following ohmmeter readings?

A
26400 ohms

B
24183 ohms

C
6600 ohms

D
39970 ohms

Q57: How many joules of energy will a 10 W lamp dissipate in one minute?

A
10 joules

B
60 joules

C
600 joules

D
3600 joules

Q58: How is power dissipated in a resistor?

A
by resistance

B
by voltage

C
by current

D
by heat

Q59: What are the two major categories for resistors?

A
low and high ohmic value

B
commercial and industrial

C
low and high power value

D
fixed and variable

Q60: If a metallic conductor has a positive temperature coefficient of resistance, then:

A
as temperature increases, resistance decreases

B
as current increases, resistance decreases

C
as voltage increases, current increases

D
as temperature increases, resistance increases

Q61: Resistance in a circuit is:

A
opposition to current

B
opposition to voltage

C
the same as current

D
the same as voltage

Q62: The power rating of a resistor is __________ related to __________.

A
directly, the type of cooling used

B
indirectly, the type of material used

C
directly, its surface area

D
indirectly, the color coding

Q63: With Ohm's law:

A
current is inversely proportional to resistance

B
resistance is directly proportional to voltage

C
voltage is indirectly proportional to power

D
current is directly proportional to resistance

Q64: With a complex circuit, a supply source senses:

A
open circuit components

B
when voltages need to be increased

C
only a single resistive connection

D
when complex currents are needed

Q65: How many amps are used by a 100 watt, 120 volt light bulb?

A
1.2 amps

B
12000 amps

C
830 mA

D
12 amps

Q66: Resistance is:

A
the opposition to current flow accompanied by the dissipation of heat

B
symbolized by R, measured in ohms, and directly proportional to conductance

C
directly proportional to current and voltage

D
represented by the flow of fluid in the fluid circuit

Q67: How many connections does a rheostat have?

A
1

B
2

C
3

D
4

Q68: Wirewound resistors are usually used in circuits that have:

A
high current

B
negative temperature coefficients

C
low power

D
high voltage

Q69: The word work means that:

A
energy has been transferred

B
it is inversely related to energy

C
no energy has been transferred

D
work and energy are not related

Q70: Power is measured in units of:

A
joules x charge

B
joules/work

C
joules x voltage

D
joules/time


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